John,
THX, I feel real dumb-assed for not knowing the EQ-DSP's..... I'm going to try it later this week and I'll get back to you. How you explain it works, that about solves my biggest let-down and will make it much easier to tweak the T3 to my needs without having to record every part seperately.
For Most instruments the fully configurable 3-band EQ will be adequate. Although for Grand Piano a 5-band still would be nice, I've put that to good use on a CP-300 in the past.

As for discussions about the "full-part-styles" : I don't do dancing gigs but Jazz and Blues-clubs, but mostly audio production in that area.
Styles of the T3 : some of them are too recognizable a one-song-hitchart style : better use a midi-file for that kind of stuff instead of packing it with single-use styles.

As for the styles being too busy : I've never heard a full band or professional recording with such a busy background as some of the styles on any arranger.
Ask any Hi-Fi freak what a cloud of different instruments playing different parts in roughly the same frequency-range does to the overall sound : the parts aren't distinguishable anymore (blurr) and it stresses the speakersystem to an extend where the overall soundquality (even the sounds outside the crowded freq range) will lose pretty much every detail and quality.
Those are the audience that come to see me perform and buy my recordings.

A dancing crowd, especially the drunk ones, won't care any shit for the sound quality. I'd cuite comfertably use my old PSR-8000 for such an audience.
I've seen crowds >5k people going bazookas on the sounds coming from overstressed and highly distorting speakers.
And as I stated before : In the end it all comes down to personal taste.

BUT : if you play for a serious audience of music-lovers and/or musicians and your virtuous playing of the keys is a big part of your show, you'd better not be using crowded accompaniment : all those parts coming out of your instrument "automatically" : that will make your playing and performance less believable and people are going to think your probably be faking your playing too.
You'll probably get away with that kind of stuff if you're back-upped on stage with 1 or 2 keyboard players faking in the background, but then again that would really be a fake performance.